/Engine/Plugins/Experimental/AVCodecs/AVCodecsCore/Source/AVCodecsCore/Public/Video/CodecUtils/CodecUtilsH264.h
Easy to understand user facing profiles from the T-Rec-H.264-201304 spec there is another enum in CodecUtilsH264 that aligns the profiles with PIC and constraints however users are not expected to understand those ones.
enum EH264Profile { Auto, CALVLC444Intra, Baseline, ConstrainedBaseline, Main, ScalableBaseline, ScalableConstrainedBaseline, ScalableHigh, ScalableConstrainedHigh, ScalableHighIntra, Extended, High, ProgressiveHigh, ConstrainedHigh, High10, High10Intra, MultiviewHigh, High422, High422Intra, StereoHigh, MultiviewDepthHigh, High444, High444Intra, MAX, }